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* Licensed to the Apache Software Foundation (ASF) under one
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* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance
* with the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.apache.cassandra.db.filter;
import java.io.DataInput;
import java.io.DataOutput;
import java.io.IOException;
import java.nio.ByteBuffer;
import java.util.Comparator;
import java.util.Iterator;
import java.util.SortedSet;
import java.util.TreeSet;
import org.apache.commons.lang3.StringUtils;
import com.google.common.collect.AbstractIterator;
import org.apache.cassandra.db.*;
import org.apache.cassandra.db.columniterator.OnDiskAtomIterator;
import org.apache.cassandra.db.columniterator.SSTableNamesIterator;
import org.apache.cassandra.db.marshal.AbstractType;
import org.apache.cassandra.io.IVersionedSerializer;
import org.apache.cassandra.io.sstable.SSTableReader;
import org.apache.cassandra.io.util.FileDataInput;
import org.apache.cassandra.utils.ByteBufferUtil;
import org.apache.cassandra.utils.FBUtilities;
public class NamesQueryFilter implements IDiskAtomFilter
{
public static final Serializer serializer = new Serializer();
public final SortedSet<ByteBuffer> columns;
// If true, getLiveCount will always return either 0 or 1. This uses the fact that we know
// CQL3 will never use a name filter with cell names spanning multiple CQL3 rows.
private final boolean countCQL3Rows;
public NamesQueryFilter(SortedSet<ByteBuffer> columns)
{
this(columns, false);
}
public NamesQueryFilter(SortedSet<ByteBuffer> columns, boolean countCQL3Rows)
{
this.columns = columns;
this.countCQL3Rows = countCQL3Rows;
}
public NamesQueryFilter(ByteBuffer column, Comparator<ByteBuffer> comparator)
{
this(FBUtilities.singleton(column, comparator));
}
public NamesQueryFilter cloneShallow()
{
// NQF is immutable as far as shallow cloning is concerned, so save the allocation.
return this;
}
public NamesQueryFilter withUpdatedColumns(SortedSet<ByteBuffer> newColumns)
{
return new NamesQueryFilter(newColumns, countCQL3Rows);
}
public OnDiskAtomIterator getColumnFamilyIterator(DecoratedKey key, ColumnFamily cf)
{
assert cf != null;
return new ByNameColumnIterator(columns.iterator(), cf, key);
}
public OnDiskAtomIterator getSSTableColumnIterator(SSTableReader sstable, DecoratedKey key)
{
return new SSTableNamesIterator(sstable, key, columns);
}
public OnDiskAtomIterator getSSTableColumnIterator(SSTableReader sstable, FileDataInput file, DecoratedKey key, RowIndexEntry indexEntry)
{
return new SSTableNamesIterator(sstable, file, key, columns, indexEntry);
}
public void collectReducedColumns(ColumnFamily container, Iterator<Column> reducedColumns, int gcBefore, long now)
{
DeletionInfo.InOrderTester tester = container.inOrderDeletionTester();
while (reducedColumns.hasNext())
container.addIfRelevant(reducedColumns.next(), tester, gcBefore);
}
public Comparator<Column> getColumnComparator(AbstractType<?> comparator)
{
return comparator.columnComparator;
}
@Override
public String toString()
{
return "NamesQueryFilter(" +
"columns=" + StringUtils.join(columns, ",") +
')';
}
public boolean isReversed()
{
return false;
}
public void updateColumnsLimit(int newLimit)
{
}
public int getLiveCount(ColumnFamily cf, long now)
{
// Note: we could use columnCounter() but we save the object allocation as it's simple enough
if (countCQL3Rows)
return cf.hasOnlyTombstones(now) ? 0 : 1;
int count = 0;
for (Column column : cf)
{
if (column.isLive(now))
count++;
}
return count;
}
public boolean maySelectPrefix(Comparator<ByteBuffer> cmp, ByteBuffer prefix)
{
for (ByteBuffer column : columns)
{
if (ByteBufferUtil.isPrefix(prefix, column))
return true;
}
return false;
}
public boolean shouldInclude(SSTableReader sstable)
{
return true;
}
public boolean countCQL3Rows()
{
return countCQL3Rows;
}
public ColumnCounter columnCounter(AbstractType<?> comparator, long now)
{
return countCQL3Rows
? new ColumnCounter.GroupByPrefix(now, null, 0)
: new ColumnCounter(now);
}
private static class ByNameColumnIterator extends AbstractIterator<OnDiskAtom> implements OnDiskAtomIterator
{
private final ColumnFamily cf;
private final DecoratedKey key;
private final Iterator<ByteBuffer> iter;
public ByNameColumnIterator(Iterator<ByteBuffer> iter, ColumnFamily cf, DecoratedKey key)
{
this.iter = iter;
this.cf = cf;
this.key = key;
}
public ColumnFamily getColumnFamily()
{
return cf;
}
public DecoratedKey getKey()
{
return key;
}
protected OnDiskAtom computeNext()
{
while (iter.hasNext())
{
ByteBuffer current = iter.next();
Column column = cf.getColumn(current);
if (column != null)
return column;
}
return endOfData();
}
public void close() throws IOException { }
}
public static class Serializer implements IVersionedSerializer<NamesQueryFilter>
{
public void serialize(NamesQueryFilter f, DataOutput out, int version) throws IOException
{
out.writeInt(f.columns.size());
for (ByteBuffer cName : f.columns)
{
ByteBufferUtil.writeWithShortLength(cName, out);
}
out.writeBoolean(f.countCQL3Rows);
}
public NamesQueryFilter deserialize(DataInput in, int version) throws IOException
{
throw new UnsupportedOperationException();
}
public NamesQueryFilter deserialize(DataInput in, int version, AbstractType comparator) throws IOException
{
int size = in.readInt();
SortedSet<ByteBuffer> columns = new TreeSet<ByteBuffer>(comparator);
for (int i = 0; i < size; ++i)
columns.add(ByteBufferUtil.readWithShortLength(in));
boolean countCQL3Rows = in.readBoolean();
return new NamesQueryFilter(columns, countCQL3Rows);
}
public long serializedSize(NamesQueryFilter f, int version)
{
TypeSizes sizes = TypeSizes.NATIVE;
int size = sizes.sizeof(f.columns.size());
for (ByteBuffer cName : f.columns)
{
int cNameSize = cName.remaining();
size += sizes.sizeof((short) cNameSize) + cNameSize;
}
size += sizes.sizeof(f.countCQL3Rows);
return size;
}
}
}